论文部分内容阅读
列方程解应用题是教学的重点,也是难点,本文就一元二次方程应用题常见的类型及解题方法,归纳提供给学生参考。一、利润问题此类问题常见的等量关系是:利润=售价-进价,总利润=每件商品的利润×销售数量,利润率=利润进价。例1:某商场销售一批名牌衬衫,现在平均每天可售出20件,每件盈利40元,为了扩大销售量,增加盈利,尽快减少库存,商场决定采取适当的降价措施,经调查发现,如果这种衬衫的售价每降低1元,那么衬衫平均每天多售出2件,商场若要平均每天盈利
Column equation solution application problem is the teaching of the key, but also difficult, this paper on a dollar quadratic equation common problems and problem solving methods, summarized to provide students with reference. First, the profit problem Common isometric relationship of such issues is: Profit = price - purchase price, total profit = profit per product × sales volume, profit margin = profit purchase price. Example 1: A certain mall sells a number of brand-name shirts, and now on average can sell 20 pieces a day, each profit 40 yuan, in order to expand sales, increase profits, reduce inventory as soon as possible, the mall decided to take appropriate price cuts, the survey found that, If the price of such a shirt to reduce 1 yuan, then an average of more than 2 shirts sold daily, shopping malls to average daily profitability